In addition to the vaccination certificate, DIVOC has an RT-PCR digital certificate capability (generation, verification). WHO will be defining the specification for these COVID test certificates as well shortly, and DIVOC team will be working with them to define this as well.
DIVOC is compliant with WHO (DDCC:VS) specifications
WHO released DDCC:VS specifications & implementation guide for member countries to enable interoperability & portability of digital vaccine certificates for cross border verification. The open-source DIVOC certificate utility has also been referred to as a system compliant with WHO-DDCC:VS core data set specifications. The main document can be accessed directly here with the two annexes: a data dictionary and a very high-level technical briefing.